<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>debug</title>
    <script>

        fn();

        var a = 10;
        var b = 20;
        c = 30;

        function fn() {
            console.log('hello');
        }

        var fn2 = function () {
            console.log('你好');
        };

        fn2();


    </script>
</head>
<body>

</body>
</html>